Air Quality Index

The U. S. Environmental Protection Agency (EPA) has provided a scale called the Air Quality Index (AQI) for rating air quality. This scale is based on the National Ambient Air Quality Standards (NAAQS). The AQI forecast is updated once daily, excluding weekends and holidays. Alternatively, you may call the Air Quality Index Hotline at (800) 249-1234 or (860) 424-4167 for the forecast or link to Airnow.gov for the most current air quality information.

Current air quality is provided below the AQI forecast section.



Current Air Quality

Air Quality for Monday, 08/24/26

Good to Moderate
AQI Scale

For current conditions, see map below.

Cautionary Statements

AQI Forecast

Forecast for Monday, 08/24/26

Good

Forecast for Tuesday, 08/25/26

Good

For local forecasts, see table below.

Restrictions For Regulated Community

Monday, 08/24/26

Restrictions Do Not Apply

Tuesday, 08/25/26

Restrictions Do Not Apply

For details, see operating restrictions page.

Historical Ozone Data
Forecasted Ozone Exceedance Days
Tips for Ozone Action Days
Air Monitoring in Connecticut


Local AQI Forecast

Town Monday, 08/24/26
FineParticles (PM2.5)		 Monday, 08/24/26
Ozone (O3)		 Tuesday, 08/25/26
FineParticles (PM2.5)		 Tuesday, 08/25/26
Ozone (O3)
Bridgeport 50 40 39 34
Danbury 44 41 28 30
Greenwich 50 42 39 36
Hartford 50 42 28 29
Madison 44 40 33 38
Middletown 50 39 28 32
New Haven 44 39 39 33
New London-Groton 44 39 33 39
Stafford 39 38 22 27
Stratford 50 40 39 34
Torrington 39 39 22 28
Waterbury 50 39 33 32
Westport 50 41 39 35

Receive AQI Notices

  • DEEP Air Quality Information 

    Subscribe to receive a daily ozone forecast between May 1 through September 30, and a daily PM2.5 forecast year round.

  • DEEP Ozone Forecast 

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  • EnviroFlash 

    Subscribe to receive air quality information by e-mail

If you have any questions regarding the Air Quality Forecast, please contact the Bureau of Air Management by phone at (860) 424-4152 or by email.